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J. W. MELLING. Safety Valve.

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JOHN W. MELLING, OF BIRKETT BANK, WIGAN, COUNTY OF LANCASTER,

` ENGLAND.

SAFETY-VALV E.

SPECIFICATION forming part of Letters Patent No. 235,889, dated December 28, 1880.

Application filed June 2l, 1880. (No model.) Patented in England November 6, 1873.

To all whom it may concern:

Beit known that I, JOHN WILLIAM MELL- ING, of Birkett Bank, Wigan, in the county of Lancaster, England, have invented new and useful Improvements in Safety or Relief Valves 5 and l do hereby declare the same to be described in the following specification and represented in the accompanying drawings, of which- Figures l, 2, and 3 are vert-ical and transverse sections of safety-valves and their cases with my invention applied thereto.

My invention relates particularly to the improved safety and relief valve and seat for which Letters Patent of the United States of America, No. 170,757, were granted to me on December 7 1875, my present improvements consisting, first, in the combination of the ,doubleseated tubular valve and its seating with a headed post connected with the latter and extending within the bore of the valve, and being for contracting or diminishing the passage for the escape of steam through such bore during rise of the valve, such device being either permanently fixed in place or adapted so as to be movable and adjusted vertically in position second, in the double-seated valve and its seating provided with a chamber, as set forth, and having certain parts, as explained, adjustable vertically, as and for the purpose or purposes as specified.

In Fig. l two double-seated valves, A A', and their seating B, substantially as shown in my said patent, are represented as applied to two steam-inducts, I I, which are conjoined at their lower parts, as shown. AOver the two valves is a lever or bar, l, adapted to a standard, C, to slide or play vertically thereon as occasion may require, such lever being pivoted or applied to the valves in manner as represented.

The valves AA and their seatin gs are shown as having faces a b a2 b2, spaces c, and a boss or seat-projections, f 2, all substantially as exhibited in the -said patent. These projections f f2 are respectively provided with short headed posts or standards t' i', extending up from them into the bore or passage of the valve in manner and formed as represented. The headed post t" of the valve A' and the projection f2 are in one piece with the seating B of that valve; but in the valve A the post i and projection f are separate from the valve-seating, except in being provided with a screw, s, to screw down into the seating, in order to conneet the part f with the seating and allow of the parts Aj" and t', especially the latter, being adj usted in altitude within the valve. The headed posts t' t are for the purpose of imped ing the escape or diminishing the ilow of steam up through the valve as the latter may rise upward, in order for the steam to be caused to act with increased power on the part or surface d, and thus be more effective in forcing the valve upward.

The spring k, which at its upper end hooks into and is connected with the bar or lever I, is shown as provided with means of varying its tension or draft on the said bar or lever, the spring at its lower part being passed or hooked into a loop, t, adapted to the standard C and to a screw-nut, m, so as to be movable vertically by the nut when revolved on a sta- ,tionary screw, u. The nut is provided with a series of holes made vertically through it at equal distances asunder, to receive in either ot them, as occasion may require, a pin or bolt, n, which, when extending through the nut and a projection, c, and held in place by a padlock, w, as shown, serves to prevent the nut from being revolved. i

The part f is to aid in the formation of the chamber e', and serves to obstruct the escape of steam from such chamber into the space around and above the post t'. The object of the part f andthe post i being adjustable, as described, is to vary the depth of the outlet of the chamber e.

In Figs. 2 and 3 the valve is shown as provided with a yoke or lever, l, and two springs, 7c le, extending down therefrom and fixed at theirlower parts to the case. This yoke is supported at its middle on a pivot projecting up from a plate, p, resting upon a nut, a3. This nut, screwed on the valve-stem, has extending underneath it a lever, q, pivoted to an arched guide, o, through which the valve-stem passes, such guide being ixed to the valve-seating B.

The lever g, as well as the lever l, (shown in Fig. 1,) is provided with a socketed head, b3, arranged opposite and close to a slot, d3, made in the valve housing or case D. The said head `tubular valve and its seating, having the open is to receive in its socket a movable arm, q, in order to enable the lever to be moved by such arm to raise the valve off its seats or allow it to be moved oft' them by the pressure of steam when it may be desirable to blow off the steam.

Within the case D, and just below its discharge-neck, is a stationary disk or plate, r, by and around which the steam while escaping can dow. This plate, with the head of the lever q, serves to prevent access being had to the valve-adjusting nut or the valve or valves for any improper purpose. l

I claim as my invention as follows:

1'. The combination of the double seated space or chamber e between the seats and valves, as set forth, with the headed post arranged within the valve and applied to the seating, the said post being either stationary 2o or adjustable vertically, as explained.

2. The post i and its supporting partf, combined and adjustable, as described, in combination with the double-seated valve provided with the chamber e, arranged in it as set forth. 25

3. The construction of the headed post r' with the double-seated tubular valve and its seating, such post being arranged within the valve and adapted so as to be either stationary or adjustable relatively to the seating, as set forth.

JOHN WILLIAM MELLING.

Witnesses:

ROBERT Moss,

Clerk, 24 Cross St., Wigan. SAMUEL TAYLOR,

Cashier, Market Place, Wigan. 

